. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . GRAVEL. CINDERS, CHATS, CEMENTING GRAVEL AND 111.—Ckoss-sections of Ballast for Class B Roads. may be noted that the thickness of the ballast under the tieis 9 inches for this class. The width of roadbed between theshoulders, recommended for Class B is 16 feet. As before,the width of the ditches is supposed to be added to this should be noted that when using cementing gravel and chertthe slo
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . GRAVEL. CINDERS, CHATS, CEMENTING GRAVEL AND 111.—Ckoss-sections of Ballast for Class B Roads. may be noted that the thickness of the ballast under the tieis 9 inches for this class. The width of roadbed between theshoulders, recommended for Class B is 16 feet. As before,the width of the ditches is supposed to be added to this should be noted that when using cementing gravel and chertthe slope of 3 : 1 is made to begin at the bottom of the tie in-stead of at a point about 2 inches below the top of the is done in order to prevent water from accumulatingaround the end of the tie in a material which is less permeablethan the other forms of ballast, 272 RAILROAD CONSTRUCTION. §236. In Fig. 112 are shown two cross-sections for ballast for roadsbelonging to Class C. On roads of this class it is assumedthat crushed rock will not be used for ballast. The width ofroadbed between shoulders is 14 feet, while the depth of ballastunderneath the tie is 6 inches. It should be noticed that th
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